In a town near mine, there are two weather warning sirens that are extremely close together. They are 813 feet/271 yards apart. That’s quite close. The one to the right in the satellite picture is a ASC T-128, the one on the right was a ASC OM-120, that was replaced recently with a ASC T-121.
The reason they are so close is it is the edge of two municipalities and I guess they did not communicate or make some sort of agreement, so they just both put up their own sirens on the edge of their community’s.
Here’s a picture of the om-120 that was removed

The T-121 that replaced it.
The T128

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Perhaps one was installed without whoever ordered it installed somehow knowing about the other siren: that’s the only thing I can think of as to how that happened.
Where were these OM-120s at?
The OM-120 was the white dot by Hillcrest Elementary school. It was replaced by a T-121.
Ohhhh Waukesha County. I don’t exactly know why they did that. The T-128 replaced an Alertronic AL-4000 quite a while ago (over 8 years) like most T-128s in the county did. I believe they put the T-121 there to keep it as it was since the T-128, while still Waukesha County, is contrlled by the city while the OM-120 was controlled by the county.
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Oh: being on opposite sides of a “local government jurisdiction line” is the reason huh? Perhaps then they could work out a deal that would result in both areas having just one siren (maybe right on the “dividing line” so things would be “equal”?), since two is overkill.
It’s a relatively common thing. Moreso when two different counties place one very close to another. Independent controlling places wont activate each other’s sirens meaning that sometimes they need to put them close to each other to get optimum coverage.
In Cole Camp, MO, the towns 2 sirens are 1837.44 ft (0.348 mi) apart from each other.
(This map is my West Central MO siren map, which is under development)
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Where did you find that. I wonder if Shelby county has one.